Searching for will likely lead you to a working copy. You can, right now, watch Mary Elizabeth Winstead scream at a malfunctioning tanning bed or witness the infamous "nail gun" scene in sub-480p glory.
The Ultimate Guide to Final Destination 3: Streaming, Trivia, and Archive Finds final destination 3 internet archive free
Let’s be real: If a studio currently sells the movie digitally (Amazon/Apple), downloading a free rip is technically copyright infringement. However, the Internet Archive operates under "Fair Use" and preservation. If the movie is currently out of print on DVD or not available on a subscription you own, most archivists view finding it on IA as abandonware. Searching for will likely lead you to a working copy